在这种情况下，如何动态更改sql查询？

Question

我有一个控制器，它根据URL'request'参数返回一个SQL查询。

switch ($request->get('request')){ 
     case '3dvideo': 
      $students = Student::orderBy('year', 'desc')->where('orientation', '3D')->inRandomOrder()->paginate(12); 
      break; 
     case '2d': 
      $students = Student::orderBy('year', 'desc')->where('orientation', '2D')->inRandomOrder()->paginate(12); 
      break; 
     case 'web': 
      $students = Student::orderBy('year', 'desc')->where('orientation', 'web')->inRandomOrder()->paginate(12); 
      break; 
     case 'all': 
      $students = Student::orderBy('year', 'desc')->inRandomOrder()->paginate(12); 
      break; 
     default: 
      $students = Student::orderBy('year', 'desc')->inRandomOrder()->paginate(12); 
      break; 
    } 

现在我有第二个参数在我的网址（一年），我不知道如何根据这两个参数做（如果今年存在的话），我回到这样一个SQL查询：

$students = Student::orderBy('year', 'desc')->where('orientation', 'web')->where('year', 'MY-YEAR')->inRandomOrder()->paginate(12); 

非常感谢您

Answer 1

你可以做这样的事情：

$students = Student::query(); 

if (in_array($request->request, ['3dvideo', '2d', 'web'])) { 
    $students = $students->where('orientation', $request->request); 
} 

if ($request->has('year')) { 
    $sudents = $students->where('year', $request->year); 
} 

$students = $students->latest('year')->inRandomOrder()->paginate(12); 

Answer 2

像那样优化查询。

$query = Student::orderBy('year', 'desc')->inRandomOrder(); 

    if($request->has('orientation')){ 
      query->where('orientation',$request->get('orientation')); 
    } 

    if($request->has('year')){ 
      query->where('year',$request->get('year')); 
    } 
    $student = $query->paginate(12);